Collisional bulk ion transport and poloidal rotation driven by neutral beam injection

Neutral beam injection (NBI) is known to significantly affect radial transport in a tokamak plasma. Furthermore, recent observations have shown poloidal velocities, in the presence of NBI, significantly in excess of the standard neoclassical value. Motivated by this, the additional collisional radia...

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Bibliographic Details
Published in:Physics of plasmas 2007-06, Vol.14 (6)
Main Authors: Newton, Sarah L., Helander, Per, Catto, Peter J.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATION
ANGULAR MOMENTUM
ASPECT RATIO
CONFINEMENT
DISTRIBUTION FUNCTIONS
HEATING
ION BEAMS
IONS
NEOCLASSICAL TRANSPORT THEORY
PLASMA
PLASMA BEAM INJECTION
ROTATION
TOKAMAK DEVICES
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Summary:Neutral beam injection (NBI) is known to significantly affect radial transport in a tokamak plasma. Furthermore, recent observations have shown poloidal velocities, in the presence of NBI, significantly in excess of the standard neoclassical value. Motivated by this, the additional collisional radial bulk ion fluxes of particles, heat and toroidal angular momentum, and the poloidal velocity, driven by fast ions from NBI have been evaluated for a low-collisionality, pure plasma, with strong toroidal rotation and arbitrary aspect ratio. Higher order velocity space structure of the fast ion distribution function can be significant, whilst the effects of toroidal acceleration caused by strong NBI dominate at large aspect ratio. The driven poloidal velocity depends strongly on system parameters, becoming larger at higher beam density and lower beam energy.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2734181